Crystal structure of the protein L-isoaspartyl methyltransferase from Escherichia coli
Fang, P., Li, X., Wang, J., Xing, L., Gao, Y., Niu, L., Teng, M.(2010) Cell Biochem Biophys 58: 163-167
- PubMed: 20857228 
- DOI: https://doi.org/10.1007/s12013-010-9103-2
- Primary Citation of Related Structures:  
3LBF - PubMed Abstract: 
Among the known covalent damages that can occur spontaneously to proteins, the formation of isoaspartyl linkages through deamidation of asparagines and isomerization of aspartates may be one of the most rapid forms under conditions of physiological pH and temperature. The protein L-isoaspartyl methyltransferase (PIMT) is thought to recognize L-isoaspartyl residues and repair this kind of damaged proteins. Curiously, there is a potential functional difference between bacterial and mammalian PIMTs. Herein, we present the crystal structure of Escherichia coli PIMT (EcPIMT) at a resolution of 1.8 Å. The enzyme we investigated was able to remain bound to its product S-adenosylhomocysteine (SAH) during crystallization. Analysis indicates that the high affinity of EcPIMT for SAH might lead to the lower activity of the enzyme.
Organizational Affiliation: 
Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, People's Republic of China.